Look into getting a woodstove with a water reservoir built in for hot water. Also look into diy solar solutions, like the inside of an old water heater tank painted black, possibly in a clear topped box with reflective material beneath. The improved plunger design clothes washers are effective enough though takes some exercise, I've hand washed when my power was down before. A wringer seems pretty essential to doing it regularly. Tons of houses have well and septic of their own and do have plumbing but there's an investment there. Whatever you do, plumbing or not, you'll need to sort your water source out as a top priority before you settle there. If no plumbing are you thinking outhouse or Humanure system? Where are you finding off grid properties? I've had trouble locating many myself. Do you have kids, how many and how old if so? What's the climate where you are headed? How far a trip to town, over what kind of roads? Are you looking at going generator/solar and low energy use or just about zero electricity? If no electric you'll need to spend a lot of energy on preserving foods and a good root cellar.